Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb3e7f5055afa1e…

MALICIOUS

PDF

79.0 KB Created: 2021-07-13 23:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ca1b9a641e62c446239674b59b0c25a SHA-1: 7fccc8371e8dd23c37f9ba4ae0bf5aecf4d31794 SHA-256: 1cb3e7f5055afa1ed642ec904ca7d74e240653dd4f0f129f38e9b94354b5c83e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious intent, likely related to delivering a payload or phishing for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9098

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feedproxy.google.com/~r/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=returning+to+work+after+meniscectomy
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e827bf86d8930991a999bd/1625827264001/40350337745.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8647798b1a92912e56a12/1625842807748/94021877809.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed3768eaa19e084bbe2e39/1626158952974/fixejikejijojat.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec81594a8bde38c3449b12/1626112345376/mesakebux.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90297db8bb141bad830f7/1625883288083/bsc_nursing_4_year_question_paper.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecc16fc38c70342faeb301/1626128751465/vikopif.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7e0159713006cbe0bef8/1626111489414/nibidefenabavukan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD347 16792 bytes
font_01_sfnt_off0000eb5e.bin
34e98454bd9ce1dfb9cf3d934bf5bc029d32265f1ce42b2cab7630726e9e6b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 11068 bytes
font_02_sfnt_off0001054a.bin
43abdec484bda34cc25640f2dec4c35b36b15dad3f0c8a6fe92400e465e0d031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 16372 bytes

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